Adjustable vibration flexible decoupling device, test system and decoupling method

Abstract

The present application provides an adjustable vibration flexible decoupling device, a test system, and a decoupling method, wherein the decoupling device includes a rigid rod, a flexible rod, and two bases, wherein the number of the flexible rods is 0-6; the ends of the rigid rod are respectively fixedly connected to the center points of the two bases; when the number of the flexible rods is 1-6, the ends of the flexible rod are respectively detachably connected to the two bases, and the flexible rods are arranged in a surrounding manner relative to the rigid rods. The present application can select different levels of decoupling devices according to the decoupling difficulty of different decoupling points, avoiding the phenomenon of poor local decoupling effect in the system.

Description

Technical Field

[0001] The present application relates to the technical field of multi-axis vibration control and methods, and in particular to an adjustable vibration flexible decoupling device and method. Background Art

[0002] The decoupling device is a critical component of multi-axis vibration test systems, enabling mechanical decoupling of the vibrations along each axis. For multi-axis vibration test systems, decoupling is typically performed using a spherical coupler. This method provides effective decoupling, but for asymmetrically arranged vibration test systems, the ball head decoupling device can suffer from uneven force distribution and large decoupling angles in some devices. This can easily prevent the ball head from returning to its equilibrium position and lead to safety concerns such as excessive internal temperatures. Summary of the Invention

[0003] In view of this, the purpose of this application is to propose an adjustable vibration flexible decoupling device, a test system and a decoupling method.

[0004] Based on the above purpose, the present application provides an adjustable vibration flexible decoupling device, comprising a rigid rod, a flexible rod and two bases, wherein the number of the flexible rods is 0-6;

[0005] The two ends of the rigid rod are respectively fixedly connected to the center points of the two bases;

[0006] When the number of the flexible rods is 1-6, the two ends of the flexible rods are detachably connected to the two bases respectively, and the flexible rods are arranged around the rigid rods.

[0007] Furthermore, the flexible rod is an aluminum rod.

[0008] Furthermore, the rigid rod is a stainless steel rod.

[0009] Furthermore, the base includes a fixing portion and a connecting portion, the connecting portion is protruding relative to the fixing portion, and the fixing portion and the connecting portion are coaxially arranged, the connecting portion is used to connect with the flexible rod and the rigid rod, and the fixing portion is used to fix the decoupling device.

[0010] Furthermore, the flexible rod is threadedly connected to the base.

[0011] The present application also provides an adjustable vibration flexibility decoupling test system, including an exciter, a simulation table and the above-mentioned decoupling device, wherein the decoupling device is located between the exciter and the simulation table, and one base of the decoupling device is fixedly connected to the output end face of the exciter, and the other base is fixedly connected to the simulation table.

[0012] Furthermore, there are multiple exciters and multiple decoupling devices, and the simulation table is configured to be connected to multiple decoupling devices, and each decoupling device is connected to one exciter.

[0013] The present application also provides a decoupling method for an adjustable vibration flexibility decoupling test system, comprising:

[0014] Obtaining a decoupling angle of a decoupling point in the vibration test system, wherein the decoupling point is a connection point between the decoupling device and the simulation table;

[0015] In response to the decoupling angle being 7-8°, the number of flexible rods of the decoupling device corresponding to the decoupling point is 0-1;

[0016] In response to the decoupling angle being 5-7°, the number of flexible rods of the decoupling device corresponding to the decoupling point is 1-2;

[0017] In response to the decoupling angle being 1.5-5°, the number of flexible rods of the decoupling device corresponding to the decoupling point is 2-4;

[0018] In response to the decoupling angle being 1-1.5°, the number of flexible rods of the decoupling device corresponding to the decoupling point is 4-6.

[0019] Furthermore, before obtaining the decoupling angle of the decoupling point in the vibration test system, the decoupling method further includes determining whether the vibration test system is a symmetrical system;

[0020] In response to the vibration test system being a symmetrical system, the decoupling angles of all the decoupling points of the vibration test system are the same;

[0021] In response to the vibration test system being an asymmetric system, the decoupling angles of the multiple decoupling points of the vibration test system need to be acquired one by one.

[0022] Furthermore, the decoupling angle of the decoupling point is positively correlated with the vibration magnitude of the exciter corresponding to the decoupling point.

[0023] As can be seen from the above, the present application provides an adjustable vibration flexible decoupling device, a test system and a decoupling method, wherein the decoupling device is formed by a flexible rod, a rigid rod and a base, and the decoupling performance of the decoupling device is changed by adjusting the number of flexible rods, so that the decoupling device is lightweight in design, easy to use and disassemble, and highly flexible. The present application can select decoupling devices of different levels according to the decoupling difficulty of different decoupling points, thereby avoiding the phenomenon of poor local decoupling effect of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1a This is a schematic structural diagram of an adjustable vibration flexible decoupling device according to an embodiment of the present application when the number of flexible rods is 6;

[0026] Figure 1b This is a schematic structural diagram of an adjustable vibration flexible decoupling device according to an embodiment of the present application when the number of flexible rods is 4;

[0027] Figure 1c This is a schematic structural diagram of the adjustable vibration flexible decoupling device according to an embodiment of the present application when the number of flexible rods is 2;

[0028] Figure 1d This is a schematic structural diagram of the adjustable vibration flexible decoupling device according to an embodiment of the present application when the number of flexible rods is 0;

[0029] Figure 2 This is a schematic structural diagram of an adjustable vibration flexibility decoupling test system according to an embodiment of the present application;

[0030] Figure 3a This is a schematic structural diagram of the adjustable vibration flexibility decoupling test system of the embodiment of the present application having a symmetrical structure;

[0031] Figure 3b This is a schematic structural diagram of an adjustable vibration flexibility decoupling test system of an embodiment of the present application having an asymmetric structure;

[0032] Figure 4 Schematic diagram of variability analysis of the adjustable vibration flexible decoupling device in an embodiment of the present application.

[0033] In the figure, 1. rigid rod; 2. flexible rod; 3. base; 31. fixing part; 32. connecting part; 4. exciter; 5. simulation table; 6. decoupling device. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0035] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] Air defense missiles are complex, multi-degree-of-freedom systems. The missile and its internal systems have complex natural frequencies. If the excitation is limited to 30 Hz, equipment with natural frequencies near 30 Hz can be initially tested, while other frequencies remain untested. However, during actual flight, random vibration occurs over a wide frequency band. This means that energy is present at all frequencies in the vibration source, each of which will induce vibration responses in the missile's structure and equipment. The consequences of these responses, including potential launch failures, remain unknown. Using multiple exciters for random vibration excitation can better simulate the vibration conditions experienced during actual flight. Failures caused by vibration in flight can be identified and corrected during final acceptance testing, ensuring a high pass rate for final product. This makes it particularly important to use a multi-exciter shaker to perform multi-axis, multi-degree-of-freedom random vibration on the missile, replacing single-axis vibration testing.

[0037] As mentioned in the background, existing technology typically utilizes a spherical coupler for decoupling, which provides effective decoupling. However, for asymmetrically arranged vibration test systems, the ball head decoupling device suffers from uneven force distribution and large decoupling angles in some devices. This can easily lead to the ball head failing to return to its equilibrium position and causing safety issues such as excessive internal temperatures. Therefore, a decoupling device that is adjustable for different situations is needed for decoupling test systems.

[0038] like Figure 1a-Figure 1d As shown, in view of this, this embodiment provides an adjustable vibration flexible decoupling device 6, including a rigid rod 1, a flexible rod 2 and two bases 3, the number of the flexible rods 2 is 0-6, and the number of the flexible rods can be 0, 1, 2, 3, 4, 5, 6.

[0039] The two ends of the rigid rod 1 are fixedly connected to the center points of the two bases 3 respectively;

[0040] When the number of the flexible rods 2 is 1-6, both ends of the flexible rods 2 are detachably connected to the two bases 3 , and the flexible rods 2 are arranged around the rigid rods 1 .

[0041] The rigid rod 1 connects the two bases 3 and plays a supporting role for the base 3. The flexible rod 2 is a cylindrical structure. The flexibility of the flexible rod 2 is used to achieve the decoupling function. The cylindrical structure can make the flexibility of the flexible rod 2 evenly distributed, thereby ensuring that the flexible rod 2 is evenly decoupled from the movement in all directions. The flexible rod 2 is set to a detachable structure. According to different decoupling requirements, the number of the flexible rods 2 can be flexibly adjusted to achieve an adjustable decoupling function. By setting different decoupling devices 6 according to different decoupling points, there will be no problems of uneven force and inappropriate decoupling angles of some devices during the decoupling process. Under the same conditions, the more flexible rods 2 there are, the greater the axial stiffness of the decoupling device 6, and the smaller the decoupling function of the corresponding decoupling device 6.

[0042] In addition, the decoupling device 6 is suitable for decoupling vibrations of 5-200 Hz. Vibrations exceeding this range are not conducive to the decoupling effect of the decoupling device 6.

[0043] In some embodiments, the flexible rod 2 is an aluminum rod. The aluminum rod has better flexibility and can meet the decoupling requirements in the decoupling device 6.

[0044] Specifically, in practical applications, the flexible rod 2 can be made of any flexible material, not limited to an aluminum rod, as long as it meets the actual decoupling requirements of the decoupling device 6 .

[0045] In some embodiments, the rigid rod 1 is a stainless steel rod, which has good rigidity and can meet the rigidity requirements of the rigid rod 1 in the decoupling device 6 and play a certain supporting role.

[0046] Specifically, in practical applications, the rigid rod 1 can be made of any material with a certain rigidity, not limited to stainless steel, as long as it meets the actual decoupling requirements of the decoupling device 6.

[0047] In some embodiments, the base 3 includes a fixing portion 31 and a connecting portion 32. The connecting portion 32 protrudes relative to the fixing portion 31, and the fixing portion 31 and the connecting portion 32 are coaxially arranged. The connecting portion 32 is used to connect to the flexible rod 2 and the rigid rod 1, and the fixing portion 31 is used to fix the decoupling device 6. The connecting portion 32 protrudes relative to the fixing portion 31 toward the rigid rod 1. The rigid rod 1 and the flexible rod 2 are both connected to the connecting portion 32 on the base 3. The fixing portion 31 and the connecting portion 32 are coaxially arranged. The connecting portion 32 is located at the center of the base 3, and the fixing portion 31 is located on the periphery of the connecting portion 32. When the decoupling device 6 is installed, the fixing portion 31 is used to fix it to another object to fix the decoupling device 6.

[0048] In some embodiments, the flexible rod 2 is threadedly connected to the base 3. The flexible rod 2 and the base 3 are detachably connected, and the threaded connection can satisfy both detachable connection and better fixation after connection, thereby largely avoiding the situation where the flexible rod 2 and the base 3 are detached and cause an unstable connection.

[0049] This embodiment provides an adjustable vibration flexibility decoupling test system, such as Figure 2 As shown, it includes an exciter 4, a simulation table 5, and the above-mentioned decoupling device 6. The decoupling device 6 is located between the exciter 4 and the simulation table 5. One base 3 of the decoupling device 6 is fixedly connected to the output end face of the exciter 4, and the other base 3 is fixedly connected to the simulation table 5. The exciter 4 is a vibration source, and the simulation table 5 is a test bench. Installing the decoupling device 6 between the exciter 4 and the simulation table 5 can decouple the motion caused by the exciter 4, meeting the test requirements of the test system.

[0050] In some embodiments, as Figure 3a and Figure 3b As shown, multiple exciters 4 and decoupling devices 6 are provided, and the simulation table 5 is configured to be connected to multiple decoupling devices 6, with each decoupling device 6 connected to one exciter 4. For the test system, to ensure the simulation effect of the test, it is necessary to apply forces of varying magnitudes in various directions to the simulation table 5. Connecting the exciters 4 to the simulation table 5 via the decoupling devices 6 can form a test system for various simulation tests. The decoupling devices 6 can also exert a decoupling effect on different exciters 4.

[0051] This embodiment provides a decoupling method for an adjustable vibration flexibility decoupling test system. The data in this embodiment are all based on the case where the flexible rod 2 of the decoupling device 6 is an aluminum rod and the rigid rod 1 is a stainless steel rod. If the flexible rod 2 or the rigid rod 1 in the decoupling device 6 is changed to other materials, the corresponding data needs to be recalculated. The decoupling method includes:

[0052] Obtain a decoupling angle of a decoupling point in the vibration test system, wherein the decoupling point is the connection point between the decoupling device 6 and the simulation table 5, and the decoupling angle is the offset angle of the decoupling point relative to the vertical line under the action of an external force. The decoupling angle of the decoupling point in the vibration test system is obtained by simulation calculation using the simulation software - ANSYS finite element software.

[0053] In response to the decoupling angle of 7-8°, the number of the two flexible rods of the decoupling device 6 corresponding to the decoupling point is 0-1. At this time, the axial stiffness of the decoupling device 6 is 35,000 N / m, which can not only meet the decoupling needs, but also play a certain supporting role to avoid axial damage to the decoupling device 6.

[0054] In response to the decoupling angle being 5-7°, the number of the two flexible rods of the decoupling device 6 corresponding to the decoupling point is 1-2, and at this time, the axial stiffness of the decoupling device 6 is 38,000 N / m.

[0055] In response to the decoupling angle being 1.5-5°, the number of the two flexible rods of the decoupling device 6 corresponding to the decoupling point is 2-4, and at this time the axial stiffness of the decoupling device 6 is 41000 N / m.

[0056] In response to the decoupling angle being 1-1.5°, the number of the flexible rods 2 of the decoupling device 6 corresponding to the decoupling point is 4-6, and at this time the axial stiffness of the decoupling device 6 is 45000 N / m.

[0057] It can be seen that as the number of the flexible rods 2 increases, the axial stiffness of the decoupling device 6 gradually increases, and the decoupling angle of the decoupling device 6 gradually decreases. When selecting the decoupling device 6, it is necessary to consider both the decoupling angle of the decoupling device 6 and the axial stiffness of the decoupling device 6 to ensure the decoupling effect of the decoupling device 6.

[0058] Specifically, such as Figure 4 As shown, when the rigid rod 1 is a stainless steel rod and the flexible rod 2 is an aluminum rod, the relationship between the decoupling angle and axial stiffness of the decoupling device 6 and the number of flexible rods 2 is shown. As the number of flexible rods increases, the decoupling angle gradually decreases nonlinearly, and the axial stiffness gradually increases.

[0059] In some embodiments, before obtaining the decoupling angle of the decoupling point in the vibration test system, the decoupling method further includes determining whether the vibration test system is a symmetrical system;

[0060] In response to the vibration test system being a symmetrical system, as Figure 3a As shown, the decoupling angles of all the decoupling points in the vibration test system are the same. At this time, it is only necessary to obtain the decoupling angle of one of the decoupling points in the vibration test system, and on this basis determine the decoupling device 6 corresponding to the decoupling angle, and then install it. The decoupling device 6 is installed in a one-to-one correspondence with the exciter 4.

[0061] In response to the vibration test system being an asymmetric system, as Figure 3b As shown, the decoupling angles of the multiple decoupling points of the vibration test system need to be obtained one by one. At this time, the torques exerted on the multiple decoupling points are different and are not necessarily regularly distributed. It is necessary to obtain the decoupling angles of the decoupling points one by one to determine the required decoupling device 6.

[0062] For Figure 3b The asymmetric vibration test system shown in the figure uses the simulation software - ANSYS finite element software to obtain the decoupling angles of the decoupling points by simulation calculation. The results show that the decoupling angles of decoupling points a, b, and c are the same, and the decoupling angles are high, and the decoupling difficulty is high; the decoupling angles of decoupling points d, e, f, and g are the same, and the decoupling angles are medium, and the decoupling difficulty is relatively simple; the decoupling angle of decoupling point h is the lowest, and the decoupling difficulty is the simplest.

[0063] Specifically, during the test, the force or torque that needs to be decoupled at decoupling points a, b, and c is relatively large, and the corresponding decoupling angle is 6°. The decoupling device with 2 flexible rods can be selected; the force or torque applied to decoupling points d, e, f, and g is smaller than that applied to decoupling points a, b, and c, and the corresponding decoupling angle is 1.5°. The decoupling device with 4 flexible rods can be selected; the decoupling point h is relatively far from the exciter and is subjected to a smaller force or torque. The decoupling device with 6 flexible rods can be selected.

[0064] In some embodiments, the decoupling angle of the decoupling point is positively correlated with the vibration level of the exciter 4 corresponding to the decoupling point. Under the same conditions, the higher the vibration level of the exciter 4, the larger the decoupling angle of the decoupling point.

[0065] It should be noted that the above description is limited to some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in an order different from that described in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0066] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0067] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. An adjustable vibration flexible decoupling device, characterized in that: It includes a rigid rod, a flexible rod and two bases, wherein the number of the flexible rods is 1-6; The two ends of the rigid rod are respectively fixedly connected to the center points of the two bases; When the number of the flexible rods is 1-6, the two ends of the flexible rods are detachably connected to the two bases, and the flexible rods are arranged around the rigid rods; The flexible rod is a cylindrical structure; the base includes a fixing portion and a connecting portion, the connecting portion is protruding relative to the fixing portion, and the fixing portion and the connecting portion are coaxially arranged, the connecting portion is used to connect with the flexible rod and the rigid rod, and the fixing portion is used to fix the decoupling device.

2. The adjustable vibration flexibility decoupling device according to claim 1, characterized in that: The flexible rod is an aluminum rod.

3. The adjustable vibration flexibility decoupling device according to claim 1, characterized in that: The rigid rod is a stainless steel rod.

4. The adjustable vibration flexibility decoupling device according to claim 1, characterized in that: The flexible rod is threadedly connected to the base.

5. An adjustable vibration flexibility decoupling test system, characterized in that: It comprises an exciter, a simulation table and the decoupling device according to any one of claims 1 to 4, wherein the decoupling device is located between the exciter and the simulation table, one base of the decoupling device is fixedly connected to the output end face of the exciter, and the other base is fixedly connected to the simulation table.

6. The adjustable vibration flexibility decoupling test system according to claim 5, characterized in that: There are multiple exciters and decoupling devices. The simulation table is configured to be connected to multiple decoupling devices, and each decoupling device is connected to one exciter.

7. A decoupling method for an adjustable vibration flexibility decoupling test system according to any one of claims 5-6, characterized in that: include: Obtaining a decoupling angle of a decoupling point in the adjustable vibration flexibility decoupling test system, wherein the decoupling point is a connection point between the decoupling device and the simulation table; In response to the decoupling angle being 5-7°, the number of flexible rods of the decoupling device corresponding to the decoupling point is 1-2; In response to the decoupling angle being 1.5-5°, the number of flexible rods of the decoupling device corresponding to the decoupling point is 2-4; In response to the decoupling angle being 1-1.5°, the number of flexible rods of the decoupling device corresponding to the decoupling point is 4-6.

8. The decoupling method of the adjustable vibration flexibility decoupling test system according to claim 7, characterized in that: Before obtaining the decoupling angle of the decoupling point in the adjustable vibration flexibility decoupling test system, the decoupling method further includes determining whether the adjustable vibration flexibility decoupling test system is a symmetrical system; In response to the adjustable vibration flexibility decoupling test system being a symmetrical system, the decoupling angles of all the decoupling points of the adjustable vibration flexibility decoupling test system are the same; In response to the adjustable vibration flexibility decoupling test system being an asymmetric system, the decoupling angles of the multiple decoupling points of the adjustable vibration flexibility decoupling test system need to be acquired one by one.

9. The decoupling method of the adjustable vibration flexibility decoupling test system according to claim 8, characterized in that: The decoupling angle of the decoupling point is positively correlated with the vibration magnitude of the exciter corresponding to the decoupling point.

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